Daughter-in-law's Breast Fever: Seung-hyeon who grew up lonely, falls in love with Hye-joo, a beautiful woman sitting next to him during a spontaneous bus trip. The two people became close and he followed her to an island with a mysterious ambiance and enjoyed an intense sex that day... Two years after being lovers, Seung-hyeon was diagnosed with acute cerebral hemorrhage and his father, who had been away for a long time, came back home to hold his son's funeral.